首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1835837篇
  免费   136200篇
  国内免费   2773篇
耳鼻咽喉   24207篇
儿科学   60607篇
妇产科学   49560篇
基础医学   276567篇
口腔科学   51652篇
临床医学   169446篇
内科学   354664篇
皮肤病学   40667篇
神经病学   141985篇
特种医学   67977篇
外国民族医学   335篇
外科学   264597篇
综合类   38562篇
现状与发展   4篇
一般理论   694篇
预防医学   146932篇
眼科学   41913篇
药学   136908篇
  9篇
中国医学   4153篇
肿瘤学   103371篇
  2018年   19742篇
  2017年   15146篇
  2016年   16666篇
  2015年   19101篇
  2014年   26234篇
  2013年   39998篇
  2012年   53832篇
  2011年   57166篇
  2010年   33315篇
  2009年   31878篇
  2008年   53831篇
  2007年   57677篇
  2006年   57655篇
  2005年   55645篇
  2004年   53715篇
  2003年   51348篇
  2002年   49753篇
  2001年   84653篇
  2000年   86266篇
  1999年   72251篇
  1998年   19909篇
  1997年   17652篇
  1996年   18199篇
  1995年   17301篇
  1994年   16068篇
  1993年   14967篇
  1992年   56759篇
  1991年   56173篇
  1990年   54405篇
  1989年   53160篇
  1988年   49052篇
  1987年   47880篇
  1986年   45647篇
  1985年   42984篇
  1984年   32498篇
  1983年   28049篇
  1982年   16235篇
  1981年   14670篇
  1979年   30431篇
  1978年   22049篇
  1977年   18493篇
  1976年   17412篇
  1975年   18903篇
  1974年   22634篇
  1973年   22216篇
  1972年   20915篇
  1971年   19598篇
  1970年   18633篇
  1969年   17424篇
  1968年   16170篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
111.
112.
There are an estimated 56 million orphans and vulnerable children across sub-Saharan Africa. Communities typically care for orphan children through informal caring arrangements – either within or outside of kinship networks. Within Kenya, an estimated 250,000 children live on the streets. There is less research related to fostering attitudes of this special population than orphans and vulnerable children generally. Important research over the past decade has illuminated multiple ways in which children are made more vulnerable because of HIV, including parental death and street-migration from HIV-affected households. As HIV transitions from a terminal illness to a chronic, manageable one, research is also required to establish how parents living with HIV can be an asset to children. In this study, we assess whether mothers living with HIV were very willing to foster biologically-related children, and street-involved children, how these fostering attitudes differed from mothers not living with HIV, and whether differences in fostering attitudes by reported HIV status were mediated by social support, family functioning and general self-rated health. Approximately 40% of mothers living with HIV were very willing to provide long-term foster care to biologically-related or street-involved children. This was less than the percentage of mothers not living with HIV, who were very willing to foster biologically-related children (61%) or street-involved children (58%). Significant portions of these differences were explained by social support, family functioning and general self-rated health. Multi-sectoral approaches are suggested by these findings in order to improve the child-fostering capacity of mothers living with HIV. Improving social support, family functioning and general self-rated health among HIV-infected mothers may not only provide protective benefits for the mothers and their children, but also expand the community’s capacity to care for orphan and vulnerable children.  相似文献   
113.
114.
115.
116.
117.
Thyroid diseases are common, and use of levothyroxine is increasing worldwide. We investigated the influence of gender, race and socioeconomic status on the diagnosis and treatment of thyroid disorders using data from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil), a multicenter cohort study of civil servants (35-74 years of age) from six Brazilian cities. Diagnosis of thyroid dysfunction was by thyrotropin (TSH), and free thyroxine (FT4) if TSH was altered, and the use of specific medications. Multivariate logistic regression models were constructed using overt hyperthyroidism/hypothyroidism and levothyroxine use as dependent variables and sociodemographic characteristics as independent variables. The frequencies of overt hyper- and hypothyroidism were 0.7 and 7.4%, respectively. Using whites as the reference ethnicity, brown, and black race were protective for overt hypothyroidism (OR=0.76, 95%CI=0.64-0.89, and OR=0.53, 95%CI=0.43-0.67, respectively, and black race was associated with overt hyperthyroidism (OR=1.82, 95%CI=1.06-3.11). Frequency of hypothyroidism treatment was higher in women, browns, highly educated participants and those with high net family incomes. After multivariate adjustment, levothyroxine use was associated with female gender (OR=6.06, 95%CI=3.19-11.49) and high net family income (OR=3.23, 95%CI=1.02-10.23). Frequency of hyperthyroidism treatment was higher in older than in younger individuals. Sociodemographic factors strongly influenced the diagnosis and treatment of thyroid disorders, including the use of levothyroxine.  相似文献   
118.
119.
120.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号